Hi Sai, Thank you for the patch! Yet something to improve: [auto build test ERROR on f4cb5e9daedf56671badc93ac7f364043aa33886] url: https://github.com/0day-ci/linux/commits/Sai-Prakash-Ranjan/coresight-etf... base: f4cb5e9daedf56671badc93ac7f364043aa33886 config: powerpc-mpc8540_ads_defconfig (attached as .config) compiler: powerpc-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/f5ab45a4aa0d4c3be07201c8d5599e6dc... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Sai-Prakash-Ranjan/coresight-etf-etb10-etr-Fix-NULL-pointer-dereference-crashes/20201022-185929 git checkout f5ab45a4aa0d4c3be07201c8d5599e6dcc37226c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from include/linux/trace_events.h:10, from include/trace/syscall.h:7, from include/linux/syscalls.h:84, from arch/powerpc/kernel/syscalls.c:19: 1511 | static bool is_kernel_event(struct perf_event *event) { return false; } | ^~~~~~~~~~~~~~~ cc1: all warnings being treated as errors -- arch/powerpc/kernel/traps.c:1663:6: error: no previous prototype for 'stack_overflow_exception' [-Werror=missing-prototypes] 1663 | void stack_overflow_exception(struct pt_regs *regs) | ^~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/kernel/traps.c:1993:6: error: no previous prototype for 'DebugException' [-Werror=missing-prototypes] 1993 | void DebugException(struct pt_regs *regs, unsigned long debug_status) | ^~~~~~~~~~~~~~ arch/powerpc/kernel/traps.c:2098:6: error: no previous prototype for 'CacheLockingException' [-Werror=missing-prototypes] 2098 | void CacheLockingException(struct pt_regs *regs, unsigned long address, | ^~~~~~~~~~~~~~~~~~~~~ arch/powerpc/kernel/traps.c:2112:6: error: no previous prototype for 'SPEFloatingPointException' [-Werror=missing-prototypes] 2112 | void SPEFloatingPointException(struct pt_regs *regs) | ^~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/kernel/traps.c:2164:6: error: no previous prototype for 'SPEFloatingPointRoundException' [-Werror=missing-prototypes] 2164 | void SPEFloatingPointRoundException(struct pt_regs *regs) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from arch/powerpc/include/asm/emulated_ops.h:10, from arch/powerpc/kernel/traps.c:41: 1511 | static bool is_kernel_event(struct perf_event *event) { return false; } | ^~~~~~~~~~~~~~~ cc1: all warnings being treated as errors vim +/is_kernel_event +1511 include/linux/perf_event.h 1478 1479 typedef int (perf_ksymbol_get_name_f)(char *name, int name_len, void *data); 1480 static inline void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len, 1481 bool unregister, const char *sym) { } 1482 static inline void perf_event_bpf_event(struct bpf_prog *prog, 1483 enum perf_bpf_event_type type, 1484 u16 flags) { } 1485 static inline void perf_event_exec(void) { } 1486 static inline void perf_event_comm(struct task_struct *tsk, bool exec) { } 1487 static inline void perf_event_namespaces(struct task_struct *tsk) { } 1488 static inline void perf_event_fork(struct task_struct *tsk) { } 1489 static inline void perf_event_text_poke(const void *addr, 1490 const void *old_bytes, 1491 size_t old_len, 1492 const void *new_bytes, 1493 size_t new_len) { } 1494 static inline void perf_event_init(void) { } 1495 static inline int perf_swevent_get_recursion_context(void) { return -1; } 1496 static inline void perf_swevent_put_recursion_context(int rctx) { } 1497 static inline u64 perf_swevent_set_period(struct perf_event *event) { return 0; } 1498 static inline void perf_event_enable(struct perf_event *event) { } 1499 static inline void perf_event_disable(struct perf_event *event) { } 1500 static inline int __perf_event_disable(void *info) { return -1; } 1501 static inline void perf_event_task_tick(void) { } 1502 static inline int perf_event_release_kernel(struct perf_event *event) { return 0; } 1503 static inline int perf_event_period(struct perf_event *event, u64 value) 1504 { 1505 return -EINVAL; 1506 } 1507 static inline u64 perf_event_pause(struct perf_event *event, bool reset) 1508 { 1509 return 0; 1510 } 1512 #endif 1513 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org